Sandwich-structure carbon-base composite material as well as preparation method and application thereof

A carbon-based composite material, sandwich technology, applied in nanotechnology, structural parts, electrical components, etc. for materials and surface science, can solve problems such as poor conductivity and poor rate performance, and achieve good conductivity and high porosity. , good reproducibility

Active Publication Date: 2018-05-04
SHENZHEN RES INST CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sodium storage capacity of amorphous carbon mainly comes from active sites, low-graphitization microcrystalline regions and microporous regions, etc. However, amorphous carbon materials, as anode materials for sodium-ion batteries, generally have poor conductivity and poor rate performance. Severe inhibition of amorphous carbon as anode for sodium-ion batteries

Method used

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  • Sandwich-structure carbon-base composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Put 1 g of chitosan and 10 g of zinc nitrate in a ball mill jar, mill for 5 hours, carbonize at 600° C., and wash with water and ethanol to obtain a porous carbon nanosheet material.

[0051] Put 0.2g of the obtained porous carbon nanosheet material in a nickel chloride solution with a concentration of 0.1mol / L and soak it for 1h. 2 h 2 The gas flow rate is 1 mL / min, the argon gas flow rate is 100 mL / min, the temperature is 700° C., and the time is 5 h. The obtained material is washed and dried to obtain a sandwich structure carbon-based composite material. The thickness of the graphitized carbon layer is about 10nm, and the thickness of the amorphous carbon layer is about 200nm. The scanning electron microscope image of the obtained sandwich structure carbon-based composite material is as follows: figure 1 shown.

[0052] The sandwich-structured carbon-based composite material prepared in this example was used as the working electrode, and the sodium was used as th...

Embodiment 2

[0054] Put 1 g of chitosan and 100 g of zinc nitrate in a ball mill jar, mill for 5 hours, carbonize at 1200° C., and wash with water and ethanol to obtain a porous carbon nanosheet material.

[0055] Soak 0.2 g of the obtained porous carbon nanosheet material in a nickel chloride solution with a concentration of 1 mol / L for 10 h. After freeze-drying, place the obtained precursor in a CVD system, and control 2 h 2 The gas flow rate is 100mL / min, the argon gas flow rate is 1000mL / min, the temperature is 1000°C, and the time is 1h. The obtained material is washed and dried to obtain a sandwich structure carbon-based composite material. The thickness of the graphitized carbon layer is about 80nm, and the thickness of the amorphous carbon layer is about 100nm.

[0056] The carbon-based material with a sandwich structure prepared in this example is used as a working electrode, and sodium is used as a counter electrode, and assembled into a button battery. At a current density of ...

Embodiment 3

[0058] Put 1 g of chitosan and 20 g of zinc nitrate in a ball mill jar, mill for 4 hours, carbonize at 1000° C., and wash with water and ethanol to obtain a porous carbon nanosheet material. Soak 0.2 g of the obtained porous carbon nanosheet material in a nickel chloride solution with a concentration of 0.5 mol / L for 5 h, and after freeze-drying, place the obtained precursor in a CVD system and control 2 h 2 The gas flow rate is 10 mL / min, the argon gas flow rate is 100 mL / min, the temperature is 800° C., and the time is 3 h. The obtained material is washed and dried to obtain a sandwich-structured carbon-based material. The graphitized carbon layer has a thickness of 50 nm, and the amorphous carbon layer has a thickness of 150 nm.

[0059] The sandwich-structured carbon-based composite material prepared in this example was used as the working electrode, and the sodium was used as the counter electrode, and assembled into a button battery. At a current density of 50mA / g, th...

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Abstract

The invention discloses a preparation method of a sandwich-structure carbon-base composite material. The preparation method comprises the following steps: (1) uniformly mixing chitosan and a zinc saltpore-forming agent, and carrying out carbonization treatment, so as to obtain a porous carbon nanosheet; and (2) soaking the porous carbon nanosheet obtained in the step (1) into a soluble nickel salt solution, taking out, drying, and carrying out CVD vapor deposition, so as to obtain the sandwich-structure carbon-base composite material. The preparation method has the beneficial effects that theraw materials are easily available, the repeatability is good, and the industrial production is easily realized. The invention discloses the sandwich-structure carbon-base composite material with good electrical conductivity. The invention further discloses application of the sandwich-structure carbon-base composite material as a negative electrode material in sodium-ion batteries. A sodium-ion battery produced from the carbon-base composite material prepared by virtue of the preparation method is high in specific capacity and good in rate capability and cycle performance.

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, in particular to a sandwich-structured carbon-based composite material and a preparation method and application thereof. Background technique [0002] Sodium-ion batteries have become a research hotspot in the new generation of secondary battery systems due to their rich sodium reserves and the advantages of existing battery achievements. Although the reaction mechanism in sodium-ion batteries is similar to that in lithium-ion batteries, the radius of sodium ions is about 55% larger than that of lithium ions. It is often relatively difficult to intercalate and diffuse sodium ions in materials with the same structure. Electrode materials determine the battery Therefore, the specific capacity, kinetic performance and cycle performance of electrode materials are correspondingly worse. Therefore, an ideal intercalation anode material for Na-ion batteries requires a large interlayer spac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/054B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/587H01M4/625H01M4/628H01M10/054Y02E60/10
Inventor 张治安陈玉祥尹盟李劼赖延清
Owner SHENZHEN RES INST CENT SOUTH UNIV
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